-meson since version ? converts backslashes to slashes, use other way to get pure filenames
---- AppStream-0.11.7/po/meson.build.orig 2017-10-22 19:36:07.000000000 +0200
-+++ AppStream-0.11.7/po/meson.build 2017-12-23 14:05:05.250748125 +0100
-@@ -21,7 +21,7 @@
- 'find ' + meson.current_source_dir() +
- ' -type f' +
- ' -iname "*.po"' +
-- ' -printf \'%f\\n\'' +
-+ ' -print | sed -e \'s,.*/,,\'' +
- ' | grep -oP \'.*(?=[.])\' | sort' +
- ' > ' + join_paths(meson.current_source_dir(), 'LINGUAS')
- ]